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Ground Investigation Report Branston Locks Development Phase 1

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Ground Investigation Report Branston Locks Development Phase 1 P/2016/00474 Received 24.03.2016 Ground Investigation Report Branston Locks Development Phase 1 CON-GE-BHAM-COSTCDX8620-GIR-001 Revision 0 February 2016 Project Name Branston Locks Development Phase 1 Document Title Ground Investigation Report 1 EXECUTIVE SUMMARY The Branston Locks Housing Development is being undertaken by Nurton Development (Quintus) Ltd, west of the A38, Burton upon Trent. Staffordshire County Council are overseeing the expansion of the highways infrastructure associated with the development and have commissioned Amey to develop the highways scheme; Phase 1 of the project is to develop new access routes from Branston Road to the proposed Branston Locks Housing Development including a new canal bridge across the Trent and Mersey Canal. This Geotechnical Investigation Report briefly outlines existing information available for the Phase 1 site access area, and presents the findings of the Ground Investigation undertaken along the proposed route of the Branston Locks Development Access Road. The ground investigation was conducted in November 2015 and included two combined percussive/rotary boreholes with a target depth of 20m, and six window sample holes with a target depth of 5m; the works were evenly split on either side of the Trent and Mersey Canal. Due to difficult ground conditions the bore hole on the eastern side of the canal was terminated before it reached a satisfactory depth; however it was decided that sufficient information had been collected during the investigation to not require further work. All other holes were advanced to depths sufficient to provide information critical to geotechnical design. In-situ testing was conducted and samples submitted for geotechnical and chemical laboratory analysis. A ground water monitoring standpipe was installed in the borehole west of the canal. Ground conditions were found to be River Terrace deposits composed of dense sands and gravels to a depth of 4.70m below ground level (bgl), overlying Weathered Mercia Mudstone to a depth of >16.20m bgl. The weathering grade of the mudstone is Grade IVa (matrix with occasional claystone pellets) where first encountered, reducing to Grade II (angular blocks of unweathered marl with virtually no matrix) by the terminal depth. The base of the Mercia Mudstone was not determined. Shallow thicknesses of made ground were encountered at three test locations, and was observed to be reworked River Terrace Deposits. Where holes were advanced in the existing A38 Branston Roundabout embankments Cohesive Fill was encountered to depths of 4.7m; this material displays characteristics of reworked Mercia Mudstone. Inspection pits advanced in proximity to the Trent and Mersey Canal showed Granular Fill material derived from River Terrace Deposits. Geochemical testing provides no results of significant issue. Doc. Ref.:COSTCDX8620 /CON-GE-BHAM-COSTCDX8620-GIR-001 Rev. 0- i - Issued: February 2016 Project Name Branston Locks Development Phase 1 Document Title Ground Investigation Report Contents 1 EXECUTIVE SUMMARY ........................................................................................ i 2 INTRODUCTION ................................................................................................. 5 2.1 Scope and Objectives of Report .......................................................................... 5 2.2 Description of Project ......................................................................................... 5 2.3 Geotechnical Category of Project ........................................................................ 6 2.4 Other Relevant Information ................................................................................ 6 3 EXISTING INFORMATION .................................................................................. 7 3.1 Topographic Maps (Old and Recent) ................................................................... 7 3.2 Geological Maps and Memoirs ............................................................................. 7 3.3 Aerial Photography ............................................................................................ 8 3.4 Records of Mines and Mineral Deposits ................................................................ 9 3.5 Land Use and Soil Survey Information ................................................................. 9 3.6 Archaeological and Historical Investigations ......................................................... 9 3.7 Existing Ground Investigation Data ..................................................................... 9 3.8 Consultation with Statutory Bodies and Agencies ................................................ 13 3.9 Flood Records ................................................................................................. 13 3.10 Contaminated Land ......................................................................................... 14 3.11 Other Relevant Information .............................................................................. 14 4 FIELD AND LABORATORY STUDIES .................................................................. 15 4.1 Walkover Survey ............................................................................................. 15 4.2 Geomorphological/Geological Mapping .............................................................. 16 4.3 Ground Investigations ...................................................................................... 16 4.4 Drainage Studies ............................................................................................. 18 4.5 Geophysical Surveys ........................................................................................ 18 4.6 Pile Tests ........................................................................................................ 18 4.7 Other Field Work ............................................................................................. 18 4.8 Laboratory Investigation .................................................................................. 18 5 GROUND SUMMARY ......................................................................................... 20 5.1 Geology and Ground Conditions ........................................................................ 20 6 GROUND CONDITIONS AND MATERIALS PROPERTIES .................................... 23 6.1 Granular Fill .................................................................................................... 23 6.2 Cohesive Fill .................................................................................................... 24 Doc. Ref.:COSTCDX8620 /CON-GE-BHAM-COSTCDX8620-GIR-001 Rev. 0- ii - Issued: February 2016 Project Name Branston Locks Development Phase 1 Document Title Ground Investigation Report 6.3 Made Ground .................................................................................................. 28 6.4 River Terrace Deposits ..................................................................................... 30 6.5 Mercia Mudstone ............................................................................................. 33 6.6 Material Properties Summary ............................................................................ 41 7 ENGINEERING ASSESSMENT ............................................................................ 43 7.1 Ground Model ................................................................................................. 43 7.2 Site Access Road ............................................................................................. 44 7.3 Branston Locks Canal Bridge ............................................................................ 45 8 COMPARISON OF PROJECT OPTIONS AND RISKS ............................................ 53 9 REFERENCES .................................................................................................... 57 10 GLOSSARY ........................................................................................................ 59 11 FIGURES ........................................................................................................... 61 12 DRAWINGS ....................................................................................................... 62 Appendix A Shepherd Gilmore Environment Limited: Report no. R0017 DH ME1072 borehole locations & extracts A.1 Appendix B CC Ground Investigation Ltd: Factual Ground Investigation Report B.2 Doc. Ref.:COSTCDX8620 /CON-GE-BHAM-COSTCDX8620-GIR-001 Rev. 0- iii - Issued: February 2016 Project Name Branston Locks Development Phase 1 Document Title Ground Investigation Report Tables Table 3-1: Summary of Superficial Geology .......................................................................................... 8 Table 3-2: Summary of Solid Geology .................................................................................................. 8 Table 3-3: BGS Borehole Data [6] ..................................................................................................... 10 Table 3-4: Summary of Geology from SGE 2009 [9] ........................................................................... 11 Table 3-5: Summary of SGE Atterberg Limit Testing [9] ...................................................................... 11 Table 3-6 Summary of SGE One Dimensional Consolidation Test ......................................................... 11 Table 3-7: Summary of SGE PSD Testing [9] ...................................................................................... 12
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